Moisture removal device for prefabricated directly-buried steam thermal insulation pipe
By designing a prefabricated direct buried steam insulation pipe moisture discharge device, the drainage components and compressed air are used to discharge accumulated water and humid air, the insulation performance degradation and corrosion problems caused by water accumulation and evaporation of the prefabricated insulation pipe are solved, and the drying and drying of the insulation layer is achieved. The corrosion resistance of the outer guard pipe extends the service life of the pipe.
Patent Information
- Application Number
- CN202420867942.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-24
AI Technical Summary
In areas with high groundwater levels and abundant rainfall, prefabricated insulation pipes are prone to accumulation of water during transportation, storage and construction, affecting the insulation performance and pipeline operation. The evaporation of moisture in the insulation layer will cause corrosion of the outer guard pipe and increase heat loss.
A prefabricated direct buried steam insulation pipe venting device is designed, including an outer guard pipe, a moisture drain pipe and a drainage assembly. The accumulated water and saturated humid air are discharged through compressed air to prevent the insulation material from being steamed in water and keep the outer guard pipe dry. Reduce heat loss and corrosion.
Effectively discharge water and humid air in the insulation layer, restore insulation performance, reduce heat loss, extend the service life of the outer guard pipe, and prevent corrosion.
Smart Images
Figure CN222209565U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of directly buried steam pipelines, in particular to a prefabricated directly buried steam insulation pipe moisture removal device. Background Art
[0002] In areas with high groundwater levels and abundant rainfall, during the transportation, storage and construction of prefabricated insulated pipes, if there is a sudden heavy rain or the groundwater is not pumped out in time, the accumulated water in the trench will enter the insulation layer inside the outer protective pipe; in addition, if the drainage pipe opening is not blocked in time or is not blocked tightly, when the accumulated water level is higher than the drainage pipe opening, the accumulated water will directly enter the insulation layer inside the outer protective pipe, affecting the insulation performance and pipeline operation. The current conventional treatment method is to cut the bottom of the outer protective pipe at the sump to drain water before backfilling the trench. Due to the long precipitation time of the water adsorbed in the insulation layer, the long drainage operation time and the large amount of engineering, it is difficult to drain all the accumulated water in the insulation layer. In addition, it is difficult to weld and repair the opening of the outer protective pipe and prevent corrosion, which easily forms a weak point in the outer protective pipe's anti-corrosion.
[0003] In addition, for the compensation section of the direct-buried steam pipe whose insulation layer is flooded or damp, during the heating or trial operation, the moisture in the insulation layer is heated and evaporated by the working pipe, and most of it can be discharged from the dehumidification pipe. A small amount of moisture forms saturated moist air in the insulation layer. This moist air is difficult to be discharged from the dehumidification pipe, which not only affects the performance of the insulation layer and increases heat loss, but also creates a high-temperature and high-humidity enclosed environment, thereby causing increased corrosion on the inner surface of the outer protective pipe.
[0004] Therefore, it is urgent to design a new type of moisture discharge device with drainage function to discharge the accumulated water in the insulation layer before the steam pipe is preheated to prevent the insulation material from being boiled in water. Utility Model Content
[0005] In view of the technical problems existing in the prior art, the utility model provides a dehumidification device for a prefabricated directly buried steam insulation pipe, which prevents the insulation material from being boiled in boiling water for a long time during the heating of the pipe or the operation of the pipeline, so that the inside of the outer protective pipe is in a dry state, the thermal insulation performance of the insulation layer is restored, and heat loss is reduced, while effectively reducing the internal corrosion of the outer protective pipe, thereby increasing the service life of the directly buried steam pipeline.
[0006] The utility model solves the above technical problems with the following technical solutions: a prefabricated direct buried steam insulation pipe dehumidification device, comprising an outer protective pipe, a dehumidification pipe, and a drainage assembly;
[0007] The outer protective pipe is provided with the dehumidification pipe in communication with the outer protective pipe at intervals on its upper part, each dehumidification pipe is provided with a drainage assembly, and two adjacent dehumidification pipes and the pipe section of the outer protective pipe therebetween constitute a compensation section;
[0008] Among them, one end of the drainage component extends out of the end of the moisture drainage pipe away from the outer protective pipe, and the other end extends to the inner bottom wall of the outer protective pipe. The compressed air injected at one end of the compensation section discharges the accumulated water or saturated humid air in the outer protective pipe from the other end.
[0009] As a further technical solution: the drainage assembly includes a drainage pipe and a filter bag;
[0010] One end of the drainage pipe extends out of the end of the dehumidification pipe away from the outer protective pipe, and the other end extends to the inner bottom wall of the outer protective pipe;
[0011] The filter mesh bag is installed on a port at one end of the drain pipe extending into the outer protective pipe.
[0012] As a further technical solution: the drainage pipe includes a straight pipe section, a curved pipe section, and an elbow which are connected in sequence from bottom to top;
[0013] The straight pipe section and the bent pipe section are respectively located in the dehumidification pipe and the outer protective pipe, one end of the elbow extends into the outer protective pipe to communicate with the straight pipe section, and the other end extends out of the port of the outer protective pipe;
[0014] Wherein, the straight pipe section and the tide discharge pipe share a vertical centerline;
[0015] The curved pipe section is tightly fixed along the inner circumferential wall of the outer protective tube, and the outer arc diameter of the curved pipe section is the inner diameter of the outer protective tube;
[0016] The lower port of the straight pipe section is arranged at the top point of the outer protective pipe, and the bottom port of the curved pipe section is arranged at the bottom point of the inner wall of the outer protective pipe.
[0017] As a further technical solution: the length of the straight pipe section is 400-600 mm.
[0018] As a further technical solution: the outer diameter of the drainage pipe is 20-40 mm smaller than the outer diameter of the moisture discharge pipe.
[0019] As a further technical solution: the dehumidification pipe is outer-coated with a dehumidification outer protective pipe.
[0020] As a further technical solution: it also includes an annular steel plate, and the inner wall of the upper port of one of the moisture discharge pipes in the compensation section and the outer wall of the drainage pipe where it is located are sealed by the annular steel plate.
[0021] As a further technical solution: a partition-type valley bottom support, a directly buried thermal insulation compensator, and a sliding support are also provided in the compensation section, and a moisture discharge pipe and a drainage pipe are respectively provided on both sides of the partition-type valley bottom support.
[0022] The beneficial effects of the utility model are:
[0023] 1. The structural design of this device allows the accumulated water in the insulation layer of the outer protective pipe to be discharged before the direct buried steam pipe is heated. During the heating or operation of the pipe, only the water adsorbed in the insulation layer is evaporated, preventing the insulation material from being boiled and damaged in boiling water, maintaining the integrity of the insulation layer, and reducing the impact on the insulation performance during the dehumidification period;
[0024] 2. After dehumidification is completed, there is a large amount of wet saturated air in the insulation layer space between the outer protective tube and the working tube, forming a high-temperature and high-humidity closed environment. The structural design of this device injects compressed air to force ventilation and dehumidification of the insulation layer, discharges the saturated wet air in the insulation layer, dries the insulation layer, restores the insulation performance of the insulation layer, reduces heat loss, and at the same time slows down the internal corrosion of the outer protective tube, prevents internal corrosion perforation, and increases the service life of the outer protective tube. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a cross-sectional structural schematic diagram of the device of the utility model;
[0026] Figure 2 for Figure 1 Schematic diagram of the AA section structure;
[0027] Figure 3 This is a schematic diagram of the state when the working tube is inserted into the device of the utility model;
[0028] Figure 4 This is a partial enlarged schematic diagram of the installation of the annular steel plate.
[0029] In the accompanying drawings, the components represented by the reference numerals are listed as follows:
[0030] Outer protective pipe 1, moisture drainage pipe 2, moisture drainage outer protective pipe 3, drainage pipe 4, straight pipe section 41, curved pipe section 42, elbow 43, filter mesh bag 5, annular steel plate 6, working pipe 7, partition type fixed support 8, directly buried thermal insulation compensator 9, sliding support 91. DETAILED DESCRIPTION
[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.
[0032] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.
[0033] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be interpreted as being more preferred or advantageous than other embodiments. In order to enable any technician in the field to implement and use the utility model, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the utility model can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the utility model obscure. Therefore, the utility model is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.
[0034] The design of the dehumidification device of the utility model enables the accumulated water in the insulation layer to be discharged without opening the bottom of the outer protective pipe 1 when water enters the insulation layer of the direct-buried steam pipe, and the accumulated water in the insulation layer can still be discharged after the trench of the direct-buried steam pipe is backfilled, thereby preventing the insulation material from being boiled in boiling water for a long time during the operation of the heating pipe or the pipeline; and a method of discharging saturated humid air in the insulation layer is proposed, so that the insulation layer is in a dry state, heat loss is reduced, and corrosion of the inner surface of the outer protective pipe 1 is slowed down.
[0035] See also Figure 1-3 As shown, the utility model specifically includes an outer protective tube 1, a dehumidification pipe 2, and a drainage assembly; the upper part of the outer protective tube 1 is provided with the dehumidification pipe 2 connected thereto at intervals, each dehumidification pipe 2 is provided with a drainage assembly, and two adjacent dehumidification pipes 2 and the pipe section of the outer protective tube 1 between them constitute a compensation section; wherein, one end of the drainage assembly extends out of the end of the dehumidification pipe 2 away from the outer protective tube 1, and the other end extends to the inner bottom wall of the outer protective tube 1, and after water enters the insulation layer space in the compensation section, the compressed air injected at one end of the compensation section can be used to discharge the accumulated water or saturated humid air in the outer protective tube 1 from the other end thereof. In order to protect the dehumidification pipe 2 and extend its service life, a dehumidification outer protective tube 3 can be provided outside the dehumidification pipe 2.
[0036] In the specific implementation process, see Figure 1-3As shown, the drainage assembly includes a drain pipe 4 and a filter bag 5; one end of the drain pipe 4 extends out of the end of the dehumidification pipe 2 away from the outer protective pipe 1, and the other end extends to the inner bottom wall of the outer protective pipe 1, so that the accumulated water in the outer protective pipe 1 enters the drain pipe 4 under the action of power and is then discharged; the filter bag 5 is installed on the end of the drain pipe 4 that extends into the outer protective pipe 1 to prevent debris from entering the drain pipe 4 and blocking it, thereby affecting drainage. The outer diameter of the drain pipe 4 is 20-40 mm smaller than the outer diameter of the dehumidification pipe 2, so that there is a gap between the outer wall of the drain pipe 4 and the inner wall of the dehumidification pipe 2.
[0037] To facilitate drainage operations, see Figure 2-4 The drainage pipe 4 includes a curved pipe section 42, a straight pipe section 41, and an elbow 43 which are connected in sequence from bottom to top; the straight pipe section 41 and the curved pipe section 42 are respectively located in the dehumidification pipe 2 and the outer protective pipe 1, one end of the elbow 43 extends to the outer protective pipe 1 to communicate with the straight pipe section 41, and the other end extends out of the port of the outer protective pipe 1; wherein the straight pipe section 41 and the dehumidification pipe 2 share a vertical centerline; and the length of the straight pipe section 41 is 400-600 mm;
[0038] The curved pipe section 42 is fixed tightly along the inner circumferential wall of the outer protective pipe 1, and the outer arc diameter of the curved pipe section 42 is the inner diameter of the outer protective pipe 1; the inner wall of one of the dehumidification pipes 2 on the compensation section is sealed with the outer wall of the drainage pipe 4 by temporarily welding an annular steel plate 6 (at this time, the drainage pipe 4 in the dehumidification pipe 2 is connected to the atmosphere), which is convenient for injecting compressed air into the other dehumidification pipe 2 and the drainage pipe 4 therein, so that the accumulated water is discharged from the drainage pipe 4 connected to one end of the annular steel plate 6, avoiding the boiling and damage of the insulation material in the water. The lower port of the straight pipe section 41 is set at the top of the outer protective pipe 1, and the bottom port of the curved pipe section 42 is set at the bottom point of the inner wall of the outer protective pipe 1.
[0039] In a specific implementation, an elbow is also provided at the end of the dehumidification pipe 2 facing away from the ground, so that the elbow 43 extends out of the elbow port on the dehumidification pipe 2 and is located in the middle of the end of the straight pipe section 41, and the elbow discharge port of the dehumidification pipe 2 is not less than 500 mm from the ground.
[0040] The utility model is achieved in this way:
[0041] 1. After opening a hole in the outer protective tube 1, the dehumidification pipe 2 is welded, and then a dehumidification outer protective tube 3 is arranged outside the dehumidification pipe 2, wherein the lower end of the dehumidification outer protective tube 3 is welded to the outer surface of the outer protective tube 1, and the upper end is located below the upper end of the dehumidification pipe 2;
[0042] 2. Select a seamless steel pipe with an outer diameter 20 mm to 40 mm smaller than that of the dehumidification pipe 2 to make the drainage pipe 4, and cold-bend one end of the seamless steel pipe into a 180° curved pipe section 42. The outer arc diameter of the curved pipe section 42 is the inner diameter of the outer protective pipe 1. There is no straight pipe section 41 at one end of the curved pipe section 42, and a straight pipe section 41 of 400 to 600 mm is left at the other end. Cold-bend one end of the straight pipe section 41 away from the curved pipe section 42 into a 180° elbow 43 to make the drainage pipe 4;
[0043] 3. Insert one end of the straight pipe section 41 of the drain pipe 4 from the outer protective pipe 1 into the dehumidification pipe 2, and the curved pipe section 42 is tightly attached to the inner layer of the outer protective pipe 1 and fixed by spot welding. A stainless steel filter bag 5 (with a pore size of about 1 mm) is installed at the port of the drain pipe 4 at the bottom of the outer protective pipe 1, and the filter bag 5 is fastened to the drain pipe 4 to prevent debris in the insulation layer of the outer protective pipe 1 from entering the drain pipe 4 and blocking drainage;
[0044] 4. Insert the outer protective pipe 1 (including the moisture discharge pipe 2 and the drainage pipe 4) into the well-insulated working pipe 7, so that the two adjacent moisture discharge pipes 2 and the pipe section of the outer protective pipe 1 between the two adjacent moisture discharge pipes 2 together constitute a compensation section; more specifically, the compensation section is provided with accessories such as a partition-type fixed support 8, a directly buried insulation compensator 9, and a sliding support 91. These accessories are conventionally set and function, so they are not described in detail. During the specific operation, a moisture discharge pipe 2 and a drainage pipe 4 are respectively set on both sides of the partition-type fixed support 8.
[0045] 5. Drainage (reference Figure 3 ): When constructing a direct-buried steam pipeline, water enters the insulation layer of the compensation section, and two adjacent partition-type fixed supports 8, as well as the working pipe 7 and the outer protective pipe 1 therein form a closed space underground, which is connected to the atmosphere through the dehumidification pipe 2 and the drainage pipe 4 at both ends of the compensation section.
[0046] After the direct buried steam pipeline is installed, a temporary annular steel plate 6 is welded between the inner wall of the dehumidification pipe 2 at one end of the compensation section and the outer wall of the drainage pipe 4 where it is located, so as to temporarily block the space between the dehumidification pipe 2 and the drainage pipe 4 at this end and leave the drainage pipe 4 at this end connected to the atmosphere; compressed air is injected into the dehumidification pipe 2 and the drainage pipe 4 at the other end of the compensation section. When the air pressure in the upper space inside the outer protective pipe 1 is greater than H mm water column, the accumulated water in the insulation layer space will be discharged through the drainage pipe 4 on the side with the annular steel plate 6, and all the water whose liquid level is higher than the lower pipe opening of the drainage pipe 4 will be discharged.
[0047] Since the insulation layer absorbs water during the soaking process, after the free water is discharged, part of the water absorbed by the insulation layer will slowly precipitate out under the action of gravity, so the above drainage operation needs to be repeated after a period of time to drain the accumulated water in the insulation layer space. After draining the accumulated water, the annular steel plate 6 is removed.
[0048] This method can be used to drain the accumulated water in the insulation layer space before or after the direct buried steam pipeline is backfilled, preventing the insulation material from being boiled in boiling water for a long time during the operation of the heating pipe or pipeline.
[0049] 6. Tidal drainage (see Figure 3 ): During this process, the annular steel plate 6 is removed;
[0050] Through multiple drainage of the above 5 steps, a large amount of free water in the insulation layer space is discharged, but a large amount of water is still adsorbed in the insulation layer, which is a wet insulation layer. During the heating or trial operation, the wet insulation layer is heated and evaporated into water vapor and discharged from the moisture discharge pipe 2. As the insulation layer around the working pipe 7 gradually evaporates, the water in the insulation layer above 100°C from the outer surface of the working pipe 7 will be completely evaporated, and the insulation layer and air layer below 100°C are filled with wet saturated air. There is condensed free water around the outer protective pipe 1, forming a high-temperature and high-humidity closed environment.
[0051] Therefore, compressed air can be injected from the dehumidification pipe 2 at one end of the compensation section, and the injected compressed air is discharged through the dehumidification pipe 2 at the other end of the compensation section after passing through the insulation layer space, so as to perform forced ventilation and dehumidification. In this process: the injected compressed air itself is unsaturated humid air with low moisture content, and is heated to 40℃~50℃ in the insulation layer space to become hot air, and its saturation is further reduced, and the moisture in the insulation layer is continuously evaporated into the unsaturated air, forming saturated humid air to be discharged from the dehumidification pipe 2 at one end of the compensation section where compressed air is not injected, and new compressed air is continuously injected, and the moisture in the insulation layer is continuously evaporated and discharged from the dehumidification pipe 2 at the other end (the dehumidification pipe 2 on the side where compressed air is not injected in the compensation section), until the insulation layer is air-dried, the insulation performance of the insulation layer is restored, and heat loss is reduced, while keeping the inner wall of the outer protective tube 1 dry, and slowing down the internal corrosion of the outer protective tube 1.
[0052] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0053] Although the preferred embodiments of the utility model have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the utility model.
[0054] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. A prefabricated direct buried steam insulation pipe dehumidification device, characterized in that: It comprises an outer protective pipe (1), a moisture discharge pipe (2), and a drainage component; The outer protective pipe (1) is provided with a dehumidification pipe (2) in communication with the outer protective pipe (1) at intervals on its upper part, each dehumidification pipe (2) is provided with a drainage assembly inside, and two adjacent dehumidification pipes (2) and the pipe section of the outer protective pipe (1) therebetween constitute a compensation section; One end of the drainage component extends out of one end of the moisture drainage pipe (2) away from the outer protective pipe (1), and the other end extends to the inner bottom wall of the outer protective pipe (1), and the accumulated water or saturated humid air formed in the outer protective pipe (1) is discharged from the other end thereof through compressed air injected into one end of the compensation section; The drainage assembly comprises a drainage pipe (4), one end of which extends out of an end of the dehumidification pipe (2) away from the outer protective pipe (1), and the other end of which extends to the inner bottom wall of the outer protective pipe (1).
2. A prefabricated direct buried steam insulation pipe dehumidification device according to claim 1, characterized in that: The drainage assembly comprises a filter mesh bag (5); The filter mesh bag (5) is installed on a port at one end of the drainage pipe (4) extending into the outer protective pipe (1).
3. A prefabricated direct buried steam insulation pipe dehumidification device according to claim 2, characterized in that: The drainage pipe (4) comprises a straight pipe section (41), a curved pipe section (42), and an elbow (43) which are connected in sequence from bottom to top; The straight pipe section (41) and the curved pipe section (42) are respectively located in the dehumidification pipe (2) and the outer protective pipe (1); one end of the elbow (43) extends into the outer protective pipe to communicate with the straight pipe section (41), and the other end extends out of the port of the outer protective pipe; Wherein, the straight pipe section (41) and the dehumidification pipe (2) share a common vertical centerline; The curved pipe section (42) is tightly fixed along the inner circumferential wall of the outer protective tube (1), and the outer arc diameter of the curved pipe section (42) is equal to the inner diameter of the outer protective tube (1); The lower port of the straight pipe section (41) is arranged at the top point of the outer protective pipe (1), and the bottom port of the curved pipe section (42) is arranged at the bottom point of the inner wall of the outer protective pipe (1).
4. A prefabricated direct buried steam insulation pipe dehumidification device according to claim 3, characterized in that: The length of the straight pipe section (41) is 400-600 mm.
5. The dehumidification device for prefabricated direct buried steam insulation pipe according to claim 3 is characterized in that: The outer diameter of the drainage pipe (4) is 20-40 mm smaller than the outer diameter of the moisture discharge pipe (2).
6. A dehumidification device for prefabricated direct-buried steam insulation pipe according to any one of claims 1 to 5, characterized in that: The moisture discharge pipe (2) is provided with an outer moisture discharge protective pipe (3) on its outer shell.
7. A dehumidification device for prefabricated direct-buried steam insulation pipe according to any one of claims 2 to 5, characterized in that: It also comprises an annular steel plate (6), through which the inner wall of the upper port of one of the moisture discharge pipes (2) in the compensation section and the outer wall of the drainage pipe (4) where it is located are sealed.
8. The dehumidification device for prefabricated direct buried steam insulation pipe according to claim 1, characterized in that: The compensation section is also provided with a partition-type fixed support (8), a directly buried thermal insulation compensator (9), and a sliding support (91), and a moisture discharge pipe (2) and a drainage pipe (4) are respectively provided on both sides of the partition-type fixed support (8).